After a team led by David Romps of the UC Berkeley crunched the numbers, they found that lightning strikes would increase in frequency by 12 percent for every degree Celsius rise in temperature. At our current rate of global warming, that's a 50 percent increase by the end of the 21st century.
Getting struck by lightning is, as conventional wisdom hold, rare, and it'll be rare even with the increase. The real danger here is lightning strikes that spark wildfires, particularly in the American West. We already know that a small rise in global average temperature can mean all sorts of extreme weather depending on where you are, including hurricanes, floods, heat waves, and, now, lightning strikes, too. [Science via Washington Post]